Consumer Protection Law
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You have no legal obligation to pay anything to his sister.
California Civil Code:
1624. (a) The following contracts are invalid, unless they, or some note or memorandum thereof, are in writing and subscribed by the party to be charged or by the party's agent:
(1) An agreement that by its terms is not to be performed within a year from the making thereof.
(2) A special promise to answer for the debt, default, or miscarriage of another, except in the cases provided for in Section 2794.
Section 2794 does not apply to your situation.
I do not think it is OK for you to be paying off an old debt of a boyfriend and it is not very gallant for him to ask you to do that. You can do it if you want, but it is not legally required.
I hope this information is helpful.
From what you wrote, that was probably for the best.
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